ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(48), С. 56285 - 56292
Опубликована: Ноя. 22, 2023
Soft
actuators
based
on
liquid
crystalline
elastomers
(LCEs)
are
captivating
significant
interest
because
of
their
unique
properties
combining
the
programmable
molecular
order
and
elasticity
polymeric
materials.
For
practical
applications,
ability
to
perform
multimodal
shape
changes
in
a
single
LCE
actuator
at
subsecond
level
is
bottleneck.
Here,
we
fabricate
monodomain
powered
by
electrostatic
force,
which
enables
fast
multidirectional
bending,
oscillation,
rotation,
complex
actuation
with
high
degree
freedom.
By
tuning
dielectric
constant
resistivity
gels,
complete
cycle
oscillation
rotation
only
takes
0.1
s.
In
addition,
exhibit
anisotropic
behaviors
that
promise
more
deployment
potential
electromechanical
system.
The
presented
study
will
pave
way
for
electrostatically
controllable
isothermal
manipulation
multimode
soft
actuator.
Photonics Research,
Год журнала:
2024,
Номер
12(10), С. 2148 - 2148
Опубликована: Июль 18, 2024
Surface
plasmons
have
been
given
high
expectations
in
terahertz
(THz)
on-chip
photonics
with
highly
bound
integrated
transmission
and
wavefront
engineering.
However,
most
surface
plasmonic
coupling
strategies
tailorable
polarization-dependent
features
are
challenged
broadband
propagation
dynamic
manipulation.
In
this
work,
a
liquid
crystal
(LC)-integrated
metadevice
based
on
arc-arrayed
pair-slit
resonators
(APSRs)
is
demonstrated.
The
mirror-symmetry
structures
of
achieve
the
spin-selective
unidirectional
achromatic
focusing,
which
characteristic
supported
by
containing
multiple
APSRs
slits
different
sizes
corresponding
to
excitation
frequencies.
Moreover,
arc
radii
precisely
designed
meet
phase
matching
condition
constructive
interference,
so
that
operating
frequency
broadened
0.33–0.60
THz
.
Furthermore,
LC
integration
provides
active
energy
distribution
between
left
right
focal
spots,
actual
modulation
depth
reaches
up
73%.
These
active,
wideband,
manipulation
mechanisms
their
devices
great
significance
for
THz-integrated
photonic
communication,
information
processing,
sensitive
sensing.
Terahertz
(THz)
wave
manipulation,
especially
the
beam
deflection,
plays
an
essential
role
in
various
applications,
such
as
next-generation
communication,
space
exploration,
and
high-resolution
imaging.
Current
THz
optical
components
devices
are
hampered
by
their
large
bulk
sizes
passive
responses,
limiting
development
of
high-performance,
miniaturized
microsystems.
Tunable
metasurfaces
offer
a
powerful
dynamic
platform
for
controlling
propagation
electromagnetic
waves.
In
this
article,
we
presented
mechanically
tunable
metasurface
(MTM),
which
can
achieve
terahertz
deflection
vary
intensity
anomalous
reflected
changing
air
gap
between
metallic
resonator
(MR)
array
with
phase
discontinuities
Au
ground
plane.
The
absence
lossy
spacer
materials
substantially
enhances
efficiency.
device
was
fabricated
combination
surface
bulk-micromachining
processes.
steering
capability
characterized
using
time
domain
spectroscopy.
When
is
50
μm,
maximum
coefficient
reaches
0.60
at
0.61
angle
~44.5°,
consistent
theoretical
predictions.
We
further
established
electrically
introducing
micro
voice
coil
motor
to
control
continuously.
It
shown
that
our
designed
MTM
demonstrates
high
modulation
depth
(~
62.5%)
target
steered
operating
frequency.
Our
results
showcase
potential
proposed
high-efficiency
manipulation.
Intelligent
metasurfaces
have
garnered
widespread
attention
owing
to
their
properties
of
sensing
electromagnetic
(EM)
environments
and
multifunctional
adaptive
EM
wave
manipulation.
However,
intelligent
with
broadband
high
optical
transparency
not
been
studied
date,
most
the
previous
lack
an
integrated
design
for
actuators
sensors,
resulting
in
lower
integration
levels.
This
study
proposes
a
novel
metasurface
manipulation
ability
from
visible
infrared
bands.
consists
transparent
current-controlled
reconfigurable
as
actuator
by
integrating
patterned
vanadium
dioxide
(VO
Physical Review Letters,
Год журнала:
2024,
Номер
133(11)
Опубликована: Сен. 9, 2024
The
past
decades
have
witnessed
the
rapid
development
of
metamaterials
and
metasurfaces.
However,
loss
is
still
a
challenging
problem
limiting
numerous
practical
applications,
including
long-range
wireless
communications,
superscattering,
non-Hermitian
physics.
Recently,
great
effort
has
been
made
to
minimize
loss,
however,
they
are
too
complicated
for
implementation
restricted
by
theoretical
limit.
Here,
we
propose
experimentally
realize
tunable
gain
metasurface
induced
negative
conductivity,
with
deep
analysis
from
scattering
theory
equivalent
circuits.
In
experiment,
create
samples
embedded
(or
positive)
conductivity
achieve
adjustable
loss).
By
varying
control
bias
voltages,
metasurfaces
can
reflect
incident
waves
additional
controllable
gain.
Interestingly,
find
inherently
pose
nonlinearities,
which
beneficial
nonlinear
optics
microwave
particularly
activation
wave-based
neural
networks.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(48), С. 56285 - 56292
Опубликована: Ноя. 22, 2023
Soft
actuators
based
on
liquid
crystalline
elastomers
(LCEs)
are
captivating
significant
interest
because
of
their
unique
properties
combining
the
programmable
molecular
order
and
elasticity
polymeric
materials.
For
practical
applications,
ability
to
perform
multimodal
shape
changes
in
a
single
LCE
actuator
at
subsecond
level
is
bottleneck.
Here,
we
fabricate
monodomain
powered
by
electrostatic
force,
which
enables
fast
multidirectional
bending,
oscillation,
rotation,
complex
actuation
with
high
degree
freedom.
By
tuning
dielectric
constant
resistivity
gels,
complete
cycle
oscillation
rotation
only
takes
0.1
s.
In
addition,
exhibit
anisotropic
behaviors
that
promise
more
deployment
potential
electromechanical
system.
The
presented
study
will
pave
way
for
electrostatically
controllable
isothermal
manipulation
multimode
soft
actuator.
